I tried to add 133 pictures to one of my libraries. Only 51 of them synced and the others just showed “sync pending”. There is no errors in the logs. I tried to restart the SeaDrive client, but then couldn’t see the libraries at all. I restarted my computer, after SeaDrive loaded, I could see the libraries again, but all the pictures that were showing “sync pending” are now gone entirely and had to readd them. Once I re-added them, then the rest of them synced. Seems like SeaDrive doesn’t behave consistently.
Which OS do you use? Windows or macOS?